Gossamer Forum: Products: Links 2.0: Customization: [HACK] <%prev%> and <%next%> links on detailed.html

Hi,

I was asked by someone to write a small mod for a charity website. It basically lets you use:

<%prev%>
<%next%>

...on detailed.html.

It will only link to the "next" and "previous" links inside the same category.

The hack is pretty simple (well, wasn't that simple to write, but its easy to install <G>)

1) Open up /admin/site_html_templates.pl , and below:

Code:
######################################################################################## 
# THE FOLLOWING ARE CGI GENERATED PAGES AND THE TEMPLATE MUST BE PRINTED, NOT RETURNED!# 
########################################################################################

..add:

Code:
sub make_prev_link { 

   my $category = $_[0]; 
   my $linkid   = $_[1]; 

   my ($use,$id); 
   open (READIT,"$db_script_path/data/links.db") || die "Cant read: $db_script_path/data/links.db . Reason: $!"; 
     while (<READIT>) { 
       # 0: id | 1: title | 2: url | 3: add date | 4: category | 5: desc  
        chomp; 
        my @tmp = split /\|/, $_; 
        if ($tmp[4] ne $category)  { next; } # skip anything that isn't in this category. 
        if ($tmp[0] < $linkid && $id ne $linkid) {  
             $use = $build_detail_url . "/" . $tmp[0] . $build_extension; 
             $id  = $tmp[0]; 
        } 
     }  
   close (READIT); 

   if (!$use) { return "" } else { return qq|<a href="$use">PREV LINK</a>|; }  

} 


sub make_next_link { 

   my $category = $_[0]; 
   my $linkid   = $_[1]; 

   my ($use,$id); 
   open (READIT,"$db_script_path/data/links.db") || die "Cant read: $db_script_path/data/links.db . Reason: $!"; 
     while (<READIT>) { 
       # 0: id | 1: title | 2: url | 3: add date | 4: category | 5: desc  
        chomp; 
        my @tmp = split /\|/, $_; 
        if ($tmp[4] ne $category)  { next; } # skip anything that isn't in this category. 
        if ($tmp[0] > $linkid && $id ne $linkid) {  
             $use = $build_detail_url . "/" . $tmp[0] . $build_extension; 
             $id  = $tmp[0]; 
             last; 
        } 
     }  
   close (READIT); 

   if (!$use) { return "" } else { return qq|<a href="$use">NEXT LINK</a>|; }  


}

Then, find:

Code:
sub site_html_detailed { 
# -------------------------------------------------------- 
# This routine will build a single page per link. It's only 
# really useful if you have a long review for each link -- 
# or more information then can be displayed in a summary. 
# 
    my %rec = @_; 

    return &load_template ('detailed.html', { 
                                        total => $total, 
                                        grand_total => $grand_total, 
                                        title_linked => $title_linked, 
                                        %rec, 
                                        %globals 
                                    } ); 
}

..and change it to:

Code:
sub site_html_detailed { 
# -------------------------------------------------------- 
# This routine will build a single page per link. It's only 
# really useful if you have a long review for each link -- 
# or more information then can be displayed in a summary. 
# 
    my %rec = @_; 

    my $next = make_next_link($rec{'Category'},$rec{'ID'}); 
    my $prev = make_prev_link($rec{'Category'},$rec{'ID'}); 

    return &load_template ('detailed.html', { 
                                        total => $total, 
                                        grand_total => $grand_total, 
                                        title_linked => $title_linked, 
                                        next  =>        $next, 
                                        prev  =>        $prev, 
                                        %rec, 
                                        %globals 
                                    } ); 
}

Then, just edit detailed.html, so you have:

<%prev%> and <%next%> whereever you want it to show.

NB: If, for example on the <%next%> link there is no ID that exists in the same category, with a higher ID - then it will just return a blank - i.e no link. This isn't a bug Smile

Enjoy!

Andy (mod)
andy@ultranerds.co.uk